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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>Document</title>
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<body>
    <script>
        //书写一个函数 函数的功能是判断一个数字是否是偶数
        function checkEven(n) {
            if (n % 2 == 0) return true;
            return false;
        }

        var result = checkEven(7);
        console.log(result); //false
    </script>
</body>

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